State Key Joint Laboratory of ESPC, State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, School of Environment, Tsinghua University, Beijing 100084, China.
State Key Laboratory of Plateau Ecology and Agriculture, College of Eco-environmental Engineering, Qinghai University, Xining 810016, China.
Sci Total Environ. 2022 Dec 10;851(Pt 2):158312. doi: 10.1016/j.scitotenv.2022.158312. Epub 2022 Aug 28.
Intermediate volatility organic compounds (IVOCs) from mobile sources contribute significantly to secondary organic aerosol (SOA) formation. However, the assessments of IVOC emissions remain considerably uncertain due to the lack of localized measured data and detailed emission source classifications. This study established a comprehensive database of IVOC emission factors (EFs) for mobile sources based on the diversified measured EFs and correlations with hydrocarbons. The provincial-level IVOC emission inventories over China were further established by integrating activity data of various mobile sources. The national mobile source IVOC emissions were 507.5 Gg in 2017. The IVOC emissions of on-road and non-road mobile sources were roughly the same. Trucks and non-road construction machineries were the major contributors to IVOC emissions, accounting for >66 % of the total. The IVOC emission characteristics and spatial distributions from various mobile sources varied significantly with different types and usages. The IVOC emission inventories with detailed classifications can be used to evaluate emission control policies for mobile sources. Incorporating localized measured data would be beneficial for a better understanding for the atmospheric impacts of mobile source IVOC emissions.
移动源排放的中等挥发性有机化合物（IVOCs）对二次有机气溶胶（SOA）的形成有重要贡献。然而，由于缺乏本地化的实测数据和详细的排放源分类，IVOC 排放的评估仍然存在很大的不确定性。本研究基于多样化的实测排放因子（EFs）和与碳氢化合物的相关性，建立了移动源 IVOC 排放因子的综合数据库。通过整合各种移动源的活动数据，进一步建立了中国省级的 IVOC 排放清单。2017 年，全国移动源 IVOC 排放量为 507.5 Gg。道路和非道路移动源的 IVOC 排放量大致相同。卡车和非道路施工机械是 IVOC 排放的主要贡献者，占总量的>66%。不同类型和用途的移动源的 IVOC 排放特征和空间分布差异显著。具有详细分类的 IVOC 排放清单可用于评估移动源的排放控制政策。纳入本地化实测数据将有助于更好地了解移动源 IVOC 排放对大气的影响。
